When Is The Best Time To Visit Barcelona

I am planning a trip to Barcelona and would like to know when the best time to visit is. I am looking for a time of year that will offer the best weather and the most enjoyable experience. I am hoping to find a time that will be warm enough to enjoy the outdoors and the beaches, but not too hot. I would also like to find a time of year that offers a variety of activities and attractions, as well as a vibrant nightlife. I am open to suggestions and advice from those who have visited Barcelona before. Please let me know your thoughts on the best time to visit this beautiful city.